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In April 2014, the Police Department went as far as producing a video to show officers during roll call, after a failed inspection.

Newly obtained documents reveal how the Police Department worked to tighten their safety policy when transporting prisoners after the arrest of Freddie Gray.

Six officers have been charged in Gray's death. Prosecutors claim Gray suffered a severe and critical neck injury as a result of being handcuffed, shackled by his feet and unrestrained inside a police van.

Policy 1114 was issued on April 3, nine days before Gray was arrested. It requires all prisoners to be secured during transport.

Police top brass issued an order the day after Gray's arrest on April 12, requiring the policy be read to officers during roll call for every shift for five consecutive days.

The General Accountability Office conducted an inspection two days later and found one prisoner unsecured while being transported by a Central District officer. The other districts passed the inspection.

Central District commander Maj. Mark Howe responded to the findings in an email saying, "Officers who operate the prisoner transport vehicle have been sent to prisoner transport training at the academy. Roll call training conducted in reference and wagon officers were given a copy of policy No. 1114 persons in police custody."

The documents further reveal that a 2009 city policy requires all occupants in city-owned vehicles to wear seatbelts.

Every district passed in 2014, but the Police Department put out a broadcast warning of random seatbelt inspections ahead of time.

In a statement to 11 News, Baltimore police Director T.J. Smith said, "These audits show improvements over the years with compliance to seatbelt policies. It also shows the importance of these policies. While we strive for perfection, we recognize the need to continue with audits like these. Our goal is 100 percent all the time for prisoners and officers alike."